亲水亲油平衡值为（）。

A．Krafft点 

B．昙点 

C．HLB 

D．CMC 

E．杀菌与消毒剂

As a graducate in computer science, he ___ to work out the problem.

A．wouldn't have failed

B．can't have failed

C．mustn’t have failed

D．might not have failed